[RFC PATCH 1/2] i2c: add bus_freq_hz in i2c_adapter

[Tudor Ambarus]

ping

On 03/26/2018 02:19 PM, Tudor Ambarus wrote:
> The clock-frequency property is not mandatory for the i2c buses. If it's
> not present in device tree, the buses usually asume that it is 100kHZ.
> There are i2c clients that need to know the i2c bus frequency in order to
> compute their wake token. Spare the clients of making (wrong) assumptions
> and save the bus frequency in the i2c_adapter structure.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus at microchip.com>
> ---
>   include/linux/i2c.h | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/include/linux/i2c.h b/include/linux/i2c.h
> index 44ad14e..7a1f26e 100644
> --- a/include/linux/i2c.h
> +++ b/include/linux/i2c.h
> @@ -671,6 +671,7 @@ struct i2c_adapter {
>   	struct rt_mutex bus_lock;
>   	struct rt_mutex mux_lock;
>   
> +	u32 bus_freq_hz;
>   	int timeout;			/* in jiffies */
>   	int retries;
>   	struct device dev;		/* the adapter device */
>